What this part is and what it does
The Siemens 3RT2916-1EH00-ZX90 is a SIRIUS surge suppressor built with diode assemblies, designed specifically for DC control circuits on S00-size contactors and control relays. It covers the full DC coil voltage range from 12 V up to 250 V, so one part number handles everything from 24 VDC panel logic up to 220 VDC railway-derived supplies. This is a DC-only suppressor — the diode combination is polarity-sensitive. The control supply voltage type is DC, meaning it will not work on an AC coil circuit. Verify your contactor or relay coil is DC-rated before specifying this part.
Mounting and panel fit
The suppressor clips directly onto the contactor via the clip-on fastening method, requiring no additional DIN-rail space or wiring. Depth is 9 mm, width 28 mm, height 46 mm — it sits flush against the S00 contactor face, adding negligible panel depth. Mounting position is any orientation, which simplifies layout in tight enclosures.